http://h7isucmawckzflxhipflydxvxpaytk5fozfk5immffg66rhboc74yxyd.onion/doku.php?id=securing_your_documents&do=edit
If you take a photo on the camera on your iPhone, for example, you can view a lot of metadata about the image, including when it was taken, the camera settings, and potentially even the exact GPS coordinates of the image.
There are reasons why you might want this – to plot on a map the pictures you’ve taken on holiday, for example.